The language figure presented in these lines can not be Alliteration because the lines do not consist of repeating identical or similar consonant sounds in words of the phrase. It can not be Personification because there is no placement to a human characteristic in those lines. It also can not be Allusion because there is no use of a reference or quotation to a fact or person.
Thus, the lines present the figure of language called Paradox. The paradox, also known as oxymoron, is a figure of speech that "fuses" opposing concepts into a single statement. It can be described as the expression of a logical idea by the use of opposing terms. In a paradoxical statement, mutually exclusive notions are put in relation and / or focus on the same reference
